Parts 21-24

Consider two hosts, A and B, connected by a switch with link of rate R-10 Mbps in the following figure. Suppose that the two hosts are separated by m 10 km and the switch is in the middle of them, and the propagation speed is s = 2 108 meters/sec. Host A (source on the left) wants to send a music file of 6.4Mbytes to Host B (destination on the right), where 1 byte 8 bits. Answer questions (21)-(24) m-meters Single Switclh S1 S2 Double Switches Figure 1: Host A-Switch-Host B. (21) In TCP/IP protocol model, the application-layer message/file needs to be encapsulated into transport- layer segments of 64,000 bytes. How many segments will be transmitted from Host A to Host B? Transport-Layer segments- (22) Assume processing and queuing delays are negligible, what is the end-to-end delay TE2E(AB) to receive the entire file in the Single-Suitch network? Propagation delay Tp(AB) Transmission delay TD(ABISEG) for ONE segment E2E delay Ts(AB) (23) At t100 msec, where is the last bit of the first segment, and the first bit of the last segment,for the single-switch network? t 100 msec: last bit/1st segment because t-100 msec: 1st bit/last segment e because (24) At t 5.0 sec, where is the last bit of the first segment, and the first bit of the last segment, for the single-switch network? (Hint: Note that there are 5 possible locations of a segment in this network A, link A-S, S, link S-B, and B. Therefore, obtain the total time for a specific segment to reach S and B, and compare with t-5.0 sec to find the answer.) t 5.0 sec: last bit/1st segment Q because t 5.0 sec: 1st bit/last segment because